The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.
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Most ad-hoc memory allocation will not be done at the page-level, so，详情可参考heLLoword翻译官方下载
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Maggie 姐与手下的妈咪（左）在新花都。这位妈咪来自四川，在香港打拼了十年（图：南方人物周刊记者 方迎忠），详情可参考Safew下载